I am NOT using the predefined headers but I am using my own "Header" in layout and using that name.
When settings the Off-Canvas postion Left / Right the menu gets disrupted.
With left the offcanvas-toggler is added to the sp-logo postion
With right the offcanvas-toggler is added to the sp-menu
It would be really better if there was a module-position that you can add to the header specific for the offcanvas-togger(burger-icon). Then the menu doesn't get disrupted.